单项选择题

A. Create a template. Declare a VisualState element in ……

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You create a Button control for the application.
You need to ensure that the application meets the following requirements:
When the mouse pointer is over the Button control, the background color of the button is set to red and
the Button control appears bigger.
When the mouse pointer is not over the Button control, the button returns to its original state.
What should you do?（）

A. Create a template. Declare a VisualState element in the template.
B. Create a StoryBoard animation. Add an EventTrigger class to the Button control that begins the StoryBoard animation.
C. Create a ScaleTransform class. Bind the ScaleX and ScaleY properties of the Button control to the Background property by using a custom value converter.
D. Add a method named ChangeAppearance in the code-behind file. Subscribe the ChangeAppearance method to the MouseEnter event of the Button control.

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